req-flash

Unopinionated middleware for creating flash messages of all types for Express apps.

Usage

1. Install req-flash:

npm install req-flash

2. Register the req-flash middleware after your session middleware:

var express      = require('express');
var cookieParser = require('cookie-parser');
var session      = require('express-session');
var flash        = require('req-flash');
 
var app          = express();
 
app.use(cookieParser());
app.use(session({ secret: '123' }));
app.use(flash());

Tipp: Use flash({ locals: 'flash' }) to magically make all flash messages available to your views by attaching them to res.locals['flash'] (or whatever you specifiy instead of 'flash').

3. Flash any amount of messages:

app.get('/test', function() {
    req.flash('successMessage', 'You are successfully using req-flash');
    req.flash('errorMessage', 'No errors, you\'re doing fine');
 
    res.redirect('/');
});
 
app.get('/', function() {
    res.send(req.flash());
});

"/test" redirects to "/" and outputs:

{
    "successMessage": "You are successfully using req-flash",
    "errorMessage": "No errors, you're doing fine"
}